patch 8.2.0778: libvterm code lags behind the upstream version

Problem:    Libvterm code lags behind the upstream version.
Solution:   Include revisions 720 - 723.
diff --git a/src/libvterm/Makefile b/src/libvterm/Makefile
index e56c10a..f231dd3 100644
--- a/src/libvterm/Makefile
+++ b/src/libvterm/Makefile
@@ -118,7 +118,7 @@
 	mkdir __distdir
 	cp LICENSE __distdir
 	mkdir __distdir/src
-	cp src/*.c src/*.h __distdir/src
+	cp src/*.c src/*.h src/*.inc __distdir/src
 	mkdir __distdir/src/encoding
 	cp src/encoding/*.inc __distdir/src/encoding
 	mkdir __distdir/include